From f82107950e9bda3779610e37bdfdccae6fc16f87 Mon Sep 17 00:00:00 2001
From: Nick Hoath <nicholas.hoath@intel.com>
Date: Thu, 29 Jan 2015 16:55:07 +0000
Subject: [PATCH] drm/i915: Fix a use-after-free in
intel_execlists_retire_requests
Remove request from list before unreferencing it, in case it's actually
the only reference. (Found by Tvrtko Ursulin)
This issue has been most likely introduced in
commit 6d3d8274bc45de4babb62d64562d92af984dd238
Author: Nick Hoath <nicholas.hoath@intel.com>
Date: Thu Jan 15 13:10:39 2015 +0000
drm/i915: Subsume intel_ctx_submit_request in to drm_i915_gem_request
Signed-off-by: Nick Hoath <nicholas.hoath@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/i915/intel_lrc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 70e449b702cc..a94346fee160 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -732,8 +732,8 @@ void intel_execlists_retire_requests(struct intel_engine_cs *ring)
intel_lr_context_unpin(ring, ctx);
intel_runtime_pm_put(dev_priv);
i915_gem_context_unreference(ctx);
- i915_gem_request_unreference(req);
list_del(&req->execlist_link);
+ i915_gem_request_unreference(req);
}
}
--
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